Duplex domestic hot water heater



, 1932. G. M. CONEKIN I DUPLEX DOMESTIC HOT WATER HEATER April 19- FiledMay 15, 1950 Pternteel Apr, 19, 132

STATES GEORGE MORRIS C(TNEKIN, O1? ASHEVILLE, NORTH CAROLINA.

DUPLEX DOMESTIC HOT WATER HEATER Application filed May 15,

The invention relates to a duplex domestic hot water heater.

The object of the present invention is to improve the construction ofhot water heaters and to provide a simple, practical and efficient hotwater heater of strong, durable and comparatively inexpensiveconstruction adapted to utilize in winter the hot water from a waterback in the furnace of the boiler of a hot water or steam heating systemfor heating the water within a hot water supply tank and equipped with agas heater adapted for use in summer for heating the water within thehot water supply tank when I the house heating system is not inoperation.

lVith these and other objects in View, the invention consists in theconstruction and novel combination and arrangement of parts hereinafterfully described, illustrated in the accompanying drawing, and set forth1n the claim hereto appended, it being understood that various changesin the form, proportion and minor details of construction within thescope of the claim, may be resorted to without departing from the spiritof the invention or sacrificing any of the advantages thereof. In thedrawing The figure of the drawing is an elevation partly in section of aduplex domestic water heater constructed in accordance with thisinvention.

In the accompanying drawing in which is illustrated the preferredembodiment of the invention. 1 designates a hot water supply tank ofvtheordinary construction mounted on a suitable support 2 and connected atits upper end with a hot water discharge pipe 3 and provided at itslower end with a draw off cock 4. An ordinary feed water line isdesigned to be 'connected with the tank 1 which is also preferablyequipped with an extra feed water pipe 5 having a valve 6 and connectedwith the top of the tank from which depends an interiorly arrangeddischarge pipe 7 extending interiorly of the tank to the lower portionthereof.

The water within the hot water supply. tank is heated by a heating coil8 arranged interiorly of the tank and extending from Col 1930. SerialNo. 452,746.

the upper portion thereof to the lower portion of the same and connectedat its upper and lower ends by upper and lower connecting pipes 9 and 10with the upper and lower ends of an exteriorly arranged coil 11 con- 5stituting a portion of a gas heater 12. The gas heater 12 is of theusual construction and comprises a casing enclosing the coil 11 and alsoreceiving a gas burner 13 which is located at the lower portion of thecasing 12 in the usual manner. The gas burner is connected with a gaspipe 14 which is preferably equipped with a gas regulator of thethermostatic type for controlling the flow of gas to the burner 13. Thegas pipe which is provided 55 with a suitable valve 15 extends to thelower portion of the tank and is connected with the burner with ahorizontal arm or portion 16. The gas regulator which may be of anydesired construction is suitably connected with the water within thesupply tank and when the water within the tank reaches a predeterminedtemperature the flow of gas will be cut oil and when the water withinthe supply tank falls below such predetermined temperature the gas willbe automatically turned a on. In practice, the burner will beconstructed with the usual pilot light, butas-the particularconstruction of the gas burner does not constitute a portion of thepresent in vention, detail illustration and description thereof isdeemed unnecessary.

The gas burner is designed for use in summer time when the hot water orsteam heater of a houseis not in operation and in winter time when thehot water or steam heater of a house is in operation the coil 8 isheated by water from the hot water or steam heating system and the upperand lower connecting pipes 9 and 10 are connected with the water back ofa boiler of a hot water or steam heating system (not shown) by upper andlower pipes 17 and 18. When the hot water or steam. heating system is inuse, the water rises from the boiler to the upper pi 17 and through theconnecting pipe 9 to the eating coil 8 and downward through the heatingcoil 8 returning through the lower pipe 18 to the boiler. In practicethe pipes 17 and 18 will be provided with suitable valves for my hand,this 15th cutting ofi the boiler of the hot wnter or steam heatingsystem when the suture is not in operation. When the gas burner is usedthe water within the coil ll. is heated und tlows upward through thesumeand through the upper connecting pipe 9 to the heating coil 8 and thendownward through the heating coil 8 to the lower connecting pipe 10 andthence to the coil 11, the difference in the temperature of the waterwithin the two coils 8 and ll producing u continuous circulation whilethe gas burner is li hted. The upper connecting pipe 9 is provided witha suituhle air rent 19 for permitting the escape of uir from the coils 8and l]. and the connecting pipes to prevent the same from becoming eirlocked and interfering with the circulation of water through" the saidcoils.

The lower connecting pipe 10 conni- (rates with the lower end of a standpipe 20 which extends to an ex ansion tank 21 adapted to keep the coilsull ot waiter and prevent excessive pressure in the coils and the saidcoils if tilled'with pure water will not scale or burn out, but willremain perfectly clean. The pressure withinthe coils may be increased orinished by raising or lowering the tank, the elevation of the expansiontank determining the pressure within the coils. The lower end of thepipe 20 is preferably connected with the lower connecting pipe 10 by asuitable coupling 22 which is also utilized for connecting the lowerpipe 10 with the pi e 18 which extends to the water back in the oilerotthe hot water or steam heating system.

What is claimed is:

A water heater comprising a tank, a coil therein, a, second coilexterior to the tank, pipe connections between corresponding ends of theinner and outer coils and forming therewith a closed water circuit freefrom any communication withthe water in the tank, means for applyingheat directly to the outer coil, independent means for heating theclosed water circuit and connected with the pipe connections between theinner and outer coils, an air vent in the upper pipe connection betweenthe coils, and an expansion tank connected with the lower pipeconnection between the-coils.

In testimony whereof l have hereunto set gig ofApril 1930.

enonon unis corn.

